Motorola MSF 5000 Instruction Manual page 253

MSF
5000
Instruction Manual
AppendixC
MUxXbus
Descriptions
RPT
USQ
ACC
DIS
EX
DA DT
TX
CD DT
ENCRYPT
SP3, SP2,
SP1
BAUD
68P81092E11 3/19/94
MUXbus Overview
Repeater Unsquelch (A5/D0)
Indicates when
the
Receiver
1
carrier squelch circuit, located on the
SSCB, detects
activity. Used
as a
prerequisite
to
keying
the station,
if
the station is
a
repeater,
and
to
gating audio
to the
transmitter
and/or
wireline.
Access
Disable (A6/D3)
Indicates that the station
is in
the
Access Disable mode. See the operation section
for
a
description of
the
Acc Dis
function.
External Data Detect (A6/D2)
When active,
the
SSCB
mutes
Tx, Local, RX1 (Repeater), and
MRTI
audio
from the
transmitter unless specially enabled for the current mode.
These audio paths may
be enabled or disabled
via
the
Field Programmer
of
with
option C678. The
Tx
Data
Audio
path is
always
routed to the transmitter, even when this bit is active.
Transmit Code Detect (A6/D1)
Indicates that
a
Wireline Code Detect
is active due to receipt of Secure
(12
Kbit)
data on the transmit wireline.
Digital Voice Encryption (A6/D0)
When active,
enables the
encryption function of
the
optional
Encrypt/Decrypt
Secure module (voice is transmitted coded).
When inactive, disables
the
encryption function (voice is transmitted clear). The decrypting function is not
affected
by
this
bit (decryption is always active when
the
proper
key
is loaded).
Special Purpose 3-1
(A7,/D3 thru A7,/D1)
These bits
are
reserved for future applications, or special customer needs.
IPCB Baud Rate
(A7/D0)
Indicates that the
IPCB
serial baud rate is not the default speed (1200 baud).
When
active,
the alternate speed is 300 baud.
C-7
C-7